Factor Total N Self-reported
arthritis, N (%)
Overall 46038 4298 (9.3)
Age < 25 4578 18 (0.4)
26 - 35 6083 59 (1)
36 - 45 7907 249 (3.2)
46 - 55 8393 578 (6.9)
56 - 65 7994 1229 (15.4)
66 - 75 6527 1210 (18.5)
> 75 4556 955 (21)
χ2 test P-value < 0.001
Gender
Male 20074 1486 (7.4)
Female 25964 2812 (10.8)
χ2 test P-value < 0.001
Qualification
No qualifications 10401 1848 (17.8)
HNC/D or equivalent or lower 23491 1736 (7.4)
Ordinary degree or higher 11957 698 (5.8)
χ2 test P-value < 0.001
Body mass index
Underweight (< 18.5) 550 27 (4.9)
Normal weight (18.5 - 25) 11892 609 (5.1)
Overweight (25 - 30) 14400 1161 (8.1)
Obese (> 30) 11374 1450 (12.8)
χ2 test P-value < 0.001
Smoking status
Never 21194 1661 (7.8)
Ex-smoker 13761 1680 (12.2)
Current 10856 951 (8.8)
χ2 test P-value < 0.001

N = number of cases; χ2 = Chi-square.